posts |
---|

296 |

303 |

295 |

297 |

296 |

268 |

310 |

**Basic statistics:** Seven teams of four students counted the number of covered sidewalk posts at Kosrae High School on the 19^{th} of July 2006. The number of posts recorded by the students is recorded in the table on the right.

- _________ Is the level of measurement for the data nominal, ordinal, or ratio?
- _________ Determine the sample size
**n**for the post data. - _________ Determine the median for the post data.
- _________ Determine the mode for the post data.
- _________ Determine the minimum count for the post data.
- _________ Determine the maximum count for the post data.
- _________ Calculate the range.
- _________ Calculate the sample mean
**x**. - _________ Calculate the sample standard deviation
**sx**for the post data. - _________ Calculate the sample Coefficient of Variation.

time x/sec | distance y/ meters |
---|---|

0 | 0 |

1.2 | 3 |

2.4 | 6 |

3.4 | 12 |

4.5 | 15 |

**Linear regression:** The same 28 students rolled a tennis ball along the 15 meter long covered walkway between the English classrooms and the math classrooms. As the ball rolled, a stopwatch was used to time the ball rolling past chalk marks on the sidewalk at three meter intervals. The data is in the table on the right.

- Plot the coordinates on the graph provided.
- Draw a best fit line through the points.
- ________ Determine the slope for the best fit line.
- ________ Find the y-intercept for the best fit line using the graph.

- ________________________ Write the best fit line in y = mx + b slope-intercept form.
- ________ What would be the predicted distance after nine seconds?
- ________ What would be the predicted time for the ball to travel 45 meters?